William



WILLIAM 4eLnMsoi\I,` or livHDDLmoWN,'NEW YORK.v

.Letters Praten: No. 75,734, datati .Zi/[arch 24, 1868.

IMPROVEMENT IN sAWs fritte dgetnlr neemt trim tigen trttett nieut mitmating mit nf its smite.

To ALL WHOM 1r MAY ooNeEN'; t

'Be it knownwthet I, WILLAMCLEMSON, of Middletown,in the county ofOrange, and State of New York,- vhave invented a.' new andusefulImprovement in Saws; and I do hereby declare that the following isafull, clear,

und cxnct descrip-tion thereof, which will enable others skilled in thenrt to make and. use the same, reference `being had tothe accompanyingdrawings, forming part of this spoccetion.

Figure 1 is :t section of saw-plate, showing a. tooth inserted accordingto my invention.

Figure 2 is n cross-section through the plate nt the .dottedline a, iig.1, showing the tongue and groove as Ythey eppeoredgewise. I Y y Thisinvention consists in u, form of tongue and groove that will prevent thespringing or warping of the edge of meeuw-plate. v t

Movable sew-teeth, tongued and grooved in the ordinary manner, if agoodor snug tit-is made of them,

tend to expand enderook the edge ot' the plete, as does also the usualmodes of securing them by rivets or screws. The same njuryhappens to thesew when it becomes heated on the edge from any canse while at work,`which frequently occurs,

b, iig. 2, shows a. groove of a. con1menform,with ntongue tted in'thatitvonly partly fills the groove. About the proportion'iot tongue shownis ample, with the usual modes ot' fastening the teeth, to secure themfirmly in the saw-blade, und also to allo'w the edge of the plate toexpand or lengthen directly, consequently without crooking, bypermittingthe tongues to be forced deeper in the grooves, causing theirsides to spring away instead of warping the body of the plate, therebyallowing the -snw-blode to expend and contract on the edge, without theteeth becoming loose or inj'uriously tight in the platte.

The tooth b is mode e tric thinner then the sow-plate, in order thatwhen the groove in the tooth is forced upon the tongues or inclinedsides of the recess, the cxtreme edges of the Agrooves willV slightlyexpend, and thereby firmly clasp the inclined sides of therecess, end'hold the tooth in` position.V The tooth is also bent sidewise andtwisted, which 'essentially contributes to aid in securing-the tooth inthe saw-plate.

I do not claim holding in' these teeth with a. spring pressure.

What I do claim, and wish to secure by Letters Patent, is-

The eurbed tooth b, when constructed thinner than, the saw-plate,slightly bent s'idewise and twisted, in combnntionwith the recess in thesuwsp'late, when'seid recess is Constructed,substantially as described.

" WM; oLEMsoN.

Witnesses:

ELrsnA I. WHEELER,

Jos. A. DENT.

